Refractory Metal Mo-47.5Re-SR (Stress relieved)
Heat-treated state · default condition
Standard stocked condition for sheet, foil, rod and wire: high strength with usable room-temperature ductility for forming and welding.
Values for the SR condition
Other Mo-47.5Re tempers and conditions
Mo-47.5Re is listed in 4 conditions; see the grade overview at Mo-47.5Re.
Compare all 4 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Annealed | Pick when maximum ductility, deep drawing or high-temperature creep service above the recrystallization temperature is required. | 490 | 860 | 26 | 23 HRC | — |
As-welded deposit | Reference condition for weld-joint design: Mo-47.5Re fusion welds stay ductile at room temperature, unlike unalloyed Mo. | 520 | 900 | 14 | 27 HRC | 5.7 % IACS |
SRDefaultThis page Stress relieved | Standard stocked condition for sheet, foil, rod and wire: high strength with usable room-temperature ductility for forming and welding. | 1,000 | 1,240 | 12 | 34 HRC | — |
Cold worked | Highest strength condition for fine wire, foil and springs where maximum strength and stiffness matter more than ductility. | 1,600 | 1,800 | 5 | 47 HRC | 5.4 % IACS |
What is Mo-47.5Re-SR?
Mo-47.5Re-SR is Mo-47.5Re heat treated to SR — standard stocked condition for sheet, foil, rod and wire: high strength with usable room-temperature ductility for forming and welding. Mo-47.5Re-SR has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 94% of refractory metal grades. Elongation at break is 12% and the elastic modulus is 360 GPa (52.2 Msi). Mo-47.5Re-SR has a density of 13.5 g/cm³ (0.488 lb/in³), heavier than 80% of refractory metal grades. It melts at 2,500°C (4,532 °F).
Advantages
- High strength — 1,000 MPa (145 ksi), better than 94% of refractory metal grades
- Stiff — 360 GPa (52.2 Msi), better than 91% of refractory metal grades
- High service temperature — 1,400°C (2,552 °F), better than 81% of refractory metal grades
- Readily welded — 75/100, better than 81% of refractory metal grades
Limitations
- High embodied carbon — 330 kg CO₂/kg, worse than 99% of refractory metal grades
- Heavy — 13.5 g/cm³ (0.488 lb/in³), worse than 80% of refractory metal grades
- Difficult to machine — 18/100, worse than 80% of refractory metal grades
Mo-47.5Re-SR properties
Typical room-temperature values for Mo-47.5Re-SR; 11 are specific to this condition. Other listed values are Mo-47.5Re reference data and may not represent this condition. Bars are the position among refractory metal grades.
Physical3
Mo-47.5Re-SR has a density of 13.5 g/cm³ (0.488 lb/in³), heavier than 80% of refractory metal grades. It melts at 2,500°C (4,532 °F).
Mechanical11
Mo-47.5Re-SR has a yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 94% of refractory metal grades. Elongation at break is 12% and the elastic modulus is 360 GPa (52.2 Msi).
Thermal6
Mo-47.5Re-SR is rated for continuous service to 1,400°C (2,552 °F). It conducts heat at 45 W/m·K (26 BTU/hr·ft·°F), better than 56% of refractory metal grades. Thermal expansion is 5.7 µm/m·K (3.17 µin/in·°F).
Electrical3
Mo-47.5Re-SR conducts electricity at 5.7 % IACS, worse than 51% of refractory metal grades.
Chemical & Environmental2
Corrosion resistance is good (55/100), worse than 72% of refractory metal grades.
Sustainability3
Producing a kilogram of Mo-47.5Re-SR takes about 5,000 MJ of energy and emits 330 kg of CO₂ — more than 99% of refractory metal grades. Typical recycled content is 40%.
Manufacturability8
Mo-47.5Re-SR's machinability is poor (18/100, worse than 80% of refractory metal grades); weldability very good (75/100); formability good (60/100).
Common Calculations5
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Mo-47.5Re-SR
Is Mo-47.5Re easy to machine?
Very abrasive and strongly work-hardening — use rigid setups, sharp carbide/CBN at low speed with heavy feed, or prefer EDM, grinding and laser cutting; avoid dwelling to prevent smearing.
Can Mo-47.5Re be welded?
GTAW or electron-beam weld in high-purity Ar/He glovebox or vacuum with scrupulously clean, low-C/O material; welds remain ductile at RT, but avoid contamination and prolonged 800–1100 °C exposure that promotes σ-phase.
Can Mo-47.5Re be formed, bent or molded?
Cold rolls to thin foil and draws to fine wire with 60–90 % reductions between vacuum/H₂ interpass anneals at 1400–1600 °C; bend radii in stress-relieved sheet should be ≥2t.
What surface finishes work on Mo-47.5Re?
Chemically etch or electropolish in alkaline/H₂SO₄-methanol baths; for oxidizing service above ~500 °C apply silicide, Ir or Pt-group protective coatings — no anodizing.
Mo-47.5Re chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Rehigh-Re composition near the room-temperature solubility limit; keeps ductility and weldability | 46.5 – 48.5 | 47.5 |
| Ctypical impurity limit | ≤ 0.01 | 0.01 |
| Otypical impurity limit | ≤ 0.01 | 0 |
| Ntypical impurity limit | ≤ 0 | 0 |
| Fetypical impurity limit | ≤ 0.01 | 0 |
| Nitypical impurity limit | ≤ 0.01 | 0 |
| Sitypical impurity limit | ≤ 0.01 | 0 |
| Mo | balance | — |
Mo-47.5Re-SR — frequently asked
What is Mo-47.5Re-SR used for?
Mo-47.5Re-SR is typically used for nuclear applications, aerospace propulsion components and high-temperature bellows and welded assemblies. In short: most weldable refractory alloy; ductile welds at room temperature; cold-rollable to thin foil.
What is the yield strength of Mo-47.5Re-SR?
Mo-47.5Re-SR has a typical yield strength of 1,000 MPa (145 ksi) and a tensile strength of 1,240 MPa (180 ksi) — stronger than 94% of refractory metal grades. Strength varies by condition: see the 4 listed tempers.
Is Mo-47.5Re-SR easy to machine?
Not especially — machinability is rated poor (18/100, worse than 80% of refractory metal grades). Very abrasive and strongly work-hardening — use rigid setups, sharp carbide/CBN at low speed with heavy feed, or prefer EDM, grinding and laser cutting; avoid dwelling to prevent smearing.
Can Mo-47.5Re-SR be welded?
Yes — weldability is rated very good (75/100). GTAW or electron-beam weld in high-purity Ar/He glovebox or vacuum with scrupulously clean, low-C/O material; welds remain ductile at RT, but avoid contamination and prolonged 800–1100 °C exposure that promotes σ-phase.
What surface finishes work on Mo-47.5Re-SR?
Chemically etch or electropolish in alkaline/H₂SO₄-methanol baths; for oxidizing service above ~500 °C apply silicide, Ir or Pt-group protective coatings — no anodizing.
Can Mo-47.5Re-SR be formed, bent or molded?
Cold rolls to thin foil and draws to fine wire with 60–90 % reductions between vacuum/H₂ interpass anneals at 1400–1600 °C; bend radii in stress-relieved sheet should be ≥2t.
What is the maximum service temperature of Mo-47.5Re-SR?
Mo-47.5Re-SR is rated for continuous use to about 1,400°C (2,552 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Mo-47.5Re-SR and Mo-47.5Re-CW?
SR is the default condition — standard stocked condition for sheet, foil, rod and wire: high strength with usable room-temperature ductility for forming and welding. CW: highest strength condition for fine wire, foil and springs where maximum strength and stiffness matter more than ductility. Yield strength is 1,000 MPa in SR versus 1,600 MPa in CW.
Sources
- Molybdenum-Rhenium (Mo-47.5Re) alloy sheet, rod and wire data — Rhenium Alloys, Inc. (2022)
- Molybdenum-rhenium alloys product information — Plansee SE (2021)
- ASM Handbook Vol. 2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials (Refractory Metals) — ASM International (1990)
- ASM Handbook Vol. 3 — Alloy Phase Diagrams (Mo-Re system) — ASM International (1992)
- Refractory metal property compilations (Mo-Re thermal/electrical data) — CRC / CINDAS (2018)
Property data is compiled from published supplier and standards handbooks and normalised for comparison. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.